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Avalanche Forecast

Archived

Mar 7th, 2023–Mar 8th, 2023

Alpine
Natural avalanches unlikely, human triggered possible.
Treeline
Natural avalanches unlikely.
Below Treeline
Natural avalanches unlikely.
Alpine
Natural avalanches unlikely, human triggered possible.
Treeline
Natural avalanches unlikely.
Below Treeline
Natural avalanches unlikely.
Alpine
Natural avalanches unlikely, human triggered possible.
Treeline
Natural avalanches unlikely.
Below Treeline
Natural avalanches unlikely.

Regions

Glacier.

Good conditions in the backcountry are seeing folks pushing into more aggressive lines. Watch that you don't tap into a shallow, faceted weak spot in the start zones. This could wake up the deep persistent weak layer that has been causing large, destructive avalanches in the surrounding neighbourhood.

Confidence

Moderate

Avalanche Summary

Several solar-triggered avalanches were observed yesterday from S faces (Single Bench, Lens, Cougar, Gunners paths), from sz 2-3.

A field team on Ross Pk today did not observe any avalanche activity.

Snowpack Summary

A crust is found on steep solar aspects, while wind slab exists in the alpine and exposed areas at tree line. 40-60cm of settled snow overlies a layer of decomposing stellars (large new snow crystals), a crust on solar aspects, or a thin layer of facets.

Although generally strong, the snowpack still sits upon a deep persistent weakness of rounding facets and a decomposed crust near the ground.

Weather Summary

Over the next few days, consistent weather conditions are expected: a mix of sun and cloud, Alpine high of -8*C by mid-afternoon with freezing levels around 1100m, and light winds from the east.

Terrain and Travel Advice

  • Carefully evaluate steep lines for wind slabs.
  • Cornices become weak with daytime heating or solar exposure.

Problems

Wind Slabs

Wind Slab avalanches are the release of a cohesive layer of snow (a slab) formed by the wind. Wind typically transports snow from the upwind sides of terrain features and deposits snow on the downwind side. Wind slabs are often smooth and rounded and sometimes sound hollow, and can range from soft to hard. Wind slabs that form over a persistent weak layer (surface hoar, depth hoar, or near-surface facets) may be termed Persistent Slabs or may develop into Persistent Slabs.